CloudCredential Expiry date is not shown

[m-ildefons]

Internal Reference: SURE-9671

CloudCredential Expiry date is not shown when it's more than 7 days in the future.

The CloudCredential secret can have an annotation rancher.io/expiration-timestamp.
This is used when the CloudCredential contains the credentials for a Harvester cluster, which are based on a token that can expire and therefore may need to be renewed.

When the CloudCredential is about to expire in the next 7 days, or when it has expired, the Rancher UI shows the expiration date in an appropriate format, such that the user can immediately see what's happening. However when the CloudCredential is not about to expire within the next 7 days and hasn't expired yet either, the expiration date is not show at all, which can be confusing to users.